報告編譯版本 關鍵程式碼
xml檔案

 <TextView
        android:id="@+id/tv_compile_version"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="10dp"
        android:padding="10dp"/>

java檔案

 private TextView mTvCompileVersion;
 mTvCompileVersion = findViewById(R.id.tv_compile_version);
 //獲取裝置編譯版本並顯示
 nt apiLevel = Integer.valueOf(Build.VERSION.SDK_INT);
 mTvCompileVersion.setText("API level:"+apiLevel);
 

限制作弊次數 關鍵程式碼
工具類

public class PreferencesUtils {
    public static void putInt(Context context, String key, int value) {
        SharedPreferences sp = context.getSharedPreferences("counttab", Context.MODE_PRIVATE);
        SharedPreferences.Editor edit = sp.edit();
        edit.putInt(key, value);
        edit.commit();
    }

    public static int getInt(Context context, String key, int value) {
        SharedPreferences sp = context.getSharedPreferences("counttab", Context.MODE_PRIVATE);
        return sp.getInt(key, 0);
    }
}
 

java檔案

 private int cheatCount = 0;//作弊次數
 private String EXTRA_COUNT = "count";
 mCheatButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                cheatCount = PreferencesUtils.getInt(getApplication(), EXTRA_COUNT, 0);
                if (PreferencesUtils.getInt(getApplication(), EXTRA_COUNT, 0) < 3) {
                    boolean answerTrue = mQuestionBank[mCurrentIndex].isAnswerTrue();
                    Intent intent = CheatActivity.newIntent(QuizActivity.this, answerTrue, mCurrentIndex);
                /*activity呼叫startActivity(Intent)方法時，調
                用請求實際發給了作業系統。
                準確地說，呼叫請求傳送給了作業系統的ActivityManager。ActivityManager負責建立
                Activity例項並呼叫其onCreate(Bundle)方法*/
                    startActivityForResult(intent, REQUEST_CODE_CHEAT);
                    cheatCount = cheatCount + 1;
                    PreferencesUtils.putInt(getApplication(), EXTRA_COUNT, cheatCount);
                    Toast.makeText(getApplication(), "您還剩餘" + (3 - cheatCount) + "次可以檢視答案", Toast.LENGTH_SHORT).show();
                } else {
                    Toast.makeText(getApplication(), "您已沒有剩餘檢視次數", Toast.LENGTH_SHORT).show();
                }
            }
        });
 

Demo下載地址：
https://download.csdn.net/download/weixin_43953649/10860923